______ is an electromagnet with its core in the form of a close magnetic ring.

A. S olenoid

B. Paraboloid

C. Toroid

D. Cycloid

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  1. One coulomb of charge consists of ________ electrons.
  2. The temperature coefficient of resistance of semiconductors is
  3. How many neutrons does a copper atom have?
  4. The amount of magnetizing force to counter balance the resid magnetic material is referred to as
  5. When the relative permeability of a material is much greater than 1a it is called _______ material.
  6. The customary energy unit in atomic and nuclear physics is
  7. How is mutual inductance between two coils decreased?
  8. Lenz's law is the consequence of the law of conservation of
  9. Lenz' law states that the direction of the induced emf and hence current
  10. The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab…
  11. All magnetic field originates from
  12. Which element has four valence electrons?
  13. If a magnetic flux cuts across 200 turns at a rate of 2Wb/sa the induced voltage according to Faraday's…
  14. Refers to the non- metallic materials that have the ferromagnetic properties of iron.
  15. If you hold the conductor with right hand so that the stretched thumb points in the direction of the…
  16. A magnetizing force of 1000 AT/m will produce a flux density of __________ i
  17. Under ordinary conditionsa a body is considered
  18. The physical motion resulting from the forces of magnetic fields is called
  19. The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge…
  20. The force acting on a unit n- pole placed at that point is called
  21. Permeance is analogous to
  22. A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
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  24. The quantity 10^6 maxwells is equivalent to one
  25. The reluctance of a magnetic circuit is not dependent on which of the following?
  26. The force between two charges placed a given distance apart ______ as the relative permittivity of the…
  27. What is the measure of the density and sign of the electric charge at a point relative to that at some…
  28. The force which set ups or tends to set up magnetic flux in a magnetic circuit
  29. Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field…
  30. When the relative permeability of a material is slightly more than 1a it is called ______ material.